Wood, or UPVC.
Carefully scrape with a razor blade
There are a few ways one can remove wood stain off of concrete. One way is to use a sandblaster to remove the stains. Another method is using wood bleach, water, and a scrubbing brush.
You can stain balsa wood.
Wood stain is abosorbed into the wood, so the wood takes on the color of the stain. This is why the features of the wood are still visible, unlike with paint.
No,Any kind of sealer you try to put on after will lift off the dried stain. And the exess stain, even when dry, will rub off on anything that touches it.If you can't get the color dark enough, they do make colored sealers you can spray or brush on.
Wood stain is for sealing and emphasising the natural colour of wood
NGR stain is a stain (the kind found in the paint aisle, not the kind on your shirt) that will not make the wood grain fibers rise up from the surface of the wood. Raised grain may have to be sanded off.
No, it will not lighten stain, just add another layer. The only way I have ever been able to lighten stain is to sand it off carefully.
All of it. Otherwise the latex stain will seal the surface of the wood and the oil will not be able to penetrate into the wood. Sanding won't remove all of the residue. You'll want to use a paint stripper/stain remover too.
If you paint over the "weathered" paint, it will chip and cause the stain to come off. Also, the stain needs a clean sanded surface in order for the wood to absorb it. Otherwise, there is no reason to use stain.
Yes, if it's a gel stain. However, if it's a penetrating stain it will not dry correctly. If you try to clean it, it will smear. If you put a clear topcoat on it, the topcoat will smear the excess stain.